There are more stars in the universe than grains of sand on Earth.
Fact #3126
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A day on Mercury lasts longer than a year on Mercury.
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The light you see from some stars today began traveling before humans existed.
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The Milky Way is just one of billions of galaxies in the universe.
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The Kepler mission searched for Earth-like exoplanets.
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Time moves slower in stronger gravitational fields.
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The Hubble Space Telescope revolutionized deep-space imaging.
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The Earth's rotation causes the Sun to appear to rise and set.
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Some birds migrate using landmarks and stars.
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